If you decide to add a floor...I used a single sheet of treated 3/4 ply front to back, notched at each brace so it fit all the way side to side...you'll need a shim between each brace in the middle and the 3/4 so no sag in the middle...and if you know how to KERF the ply, you can make it follow the curve all the way to the front deck...I covered mine w/light brown indoor/outdoor carpet and it couldn't have looked or worked out better
